Steam generator



INVENTEIR TTUHNEYE;

Patented Nov. 13 1833.

W. LUTZ STEAM GENERATOR.

(No Model!) WITNESSES.

ZM Q J UNITED STATES PATENT OFFICE.

GEORGE W. LUTZ, OF WHEELING, WEST VIRGINIA, ASSIGNOR OF ONE-HALF TO JOHN S. TRIMBLE, OF SAME PLACE.

STEAM-GEN E RATOR.

SPECIFICATION forming part of Letters Patent No. "289,584, dated November 13, 1883.

i H Application filed July 23, 1883. (No model.)

f all whom it may concern:

Be it known that I, GEORGEW. LUTZ, a resident of Wheeling, in thecounty of Ohio and State of West Virginia, have invented certain new and useful Improvements in Steam- Generators; and I do hereby declare that the followingis'a full, clear, and exactdesc'ription of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This. invention relates to that class of steam generators that are used for house-heating purposes; and it consists of the combination and arrangement of the various parts, as hereinafter more fully set forth and claimed.

In the drawings, Figure 1 is a vertical central section of my invention on line A A, and Fig. 2 is a cross-section on lineXX. Figs. 3 and 4 are enlarged details of construction. Like letters of reference refer to like parts.

The steamgenerator is composed of three principal partsviz., the furnace or combustion chamber F, the boiler K, and steam-dome 'E-the whole being cylindrical in form and resting on a base, J, and surrounded by a brick wall, B. G represents the outer case or jacket of the boiler proper, provided with a head, I. Inside of this case is the furnace F, made somewhat smaller in diameter than the boiler, to

admit of an annular water-space between the two walls. The bottom edge of the furnace is enlarged'to same diameter as the case of the boiler and riveted together to make a watertight joint.

R is the crown-sheet of the furnace, riveted to the top edge of the case D.

In the center of the head of the boiler is a pipe, N, which connects the boiler with the steamdome E, which is placed directly over the boiler, but a short distance above. This .pipeis' screw-threaded on the ends, and screws into the head of the boiler and bottom of the steam-dome.

T is the wall of the steam-dome. n is the top, and mis the bottom, both riveted to the outer case.

On the outside of the boiler, and connecting with the same atthe bottom of the case, are a of the steamdome.

series of water-tubes marked e e. These pipes extend upwardand connect with the bottom Their ends are screwthreaded, so they can be readily removed when required to take the apparatus apart. The lower-end is connected by means of a screwthreaded elbow-nipple, d, j am-nut c, and packing-ring f. When it is required to remove the dome, the tubes are screwed downward into and the other end enlarged and fitted with a screw-threaded bore to receive the threaded end of the upper portion, (shown fully in Fig.

4,) one end of which passes through the head of the steam-dome and is provided with a threaded nut. This construction of the stayrod allows the dome to be removed by simply unscrewing the upper portion of the stay-rod, and avoids the liability of causing aleakpvhere the lower endof the rod is riveted to the top of the furnace, by careless handling, as would be the case if the rod were in one length.

9 g are small stay-rods to stiffenthe bottom and top of the steam-dome.

b b are a series of short-length fire-tubes extending the boiler. The fire and smoke pass upward through these tubes into the space under the steam-dome, and are then deflected outward and downward aroundthe outside of the watertubes connecting the boiler and the steamdome, and from the space between the furnace and brick wall the smoke passes out the smokeflu'e k to the chimney.

L is a steam-pipe to 'convey steam to the radiators. the boiler.

.11 is the grate of the furnace, of ordinary construction; G, opening for fuel.

The arrangement of the water pipes on the outside of the boiler and the central connect- Ioo ing-pipe between the dome and boiler gives a perfect circulation of the water and provides from the top of the furnace through 8 5 o is the feed-water pipe to supply eeaase a large radiating-surface, and also admits of the apparatus being taken apart for convenience in transportation and for repairs. i The boiler being less in diameter than the steamdome gives a large hot-air space around the same without having to increase the area of the brick-work to provide for it.

, The furnace being entirely surrounded by. water, there is no waste heat, it being all applied to making'steam, and the grate being smaller than these usually made in furnaces of this class, the consumption of fuelis proportionately less and the fire-surface greater.

} The fire-tubes being of short length-about sixteen inches longethey will not choke with soot, because they are situated directly above the furnace, and the intense heat will burn the soot and prevent it from accumulating on the sides of the flues.

It will be understood that it is the intention to provide the apparatus with steamgages, safety-valves, and such other needful appliances as are usual and well known in a steamgenerator of this class, and therefore a detail description of them is not deemed necessary.

, A double row of water-tubes can be placed around the boiler, in cases where it is desira ble to increase the size of the generator, by simplyenlarging the steam-dome.

Having described my invention, what I cl aim, and desire to secure by Letters Patent of the United States, is

1. Thecombination of the furnace F, boiler K, the steam-dome E, situatedabove the boil- ..er, with an intervening space, and connected 5 to the boiler by means of a series of vertical water-pipes, 6, around the outside of the boiler, a central pipe, N, and a stay-rod, M, arranged by screw-thread connections so that the dome can be readily removed, substantially as herein shown.

2." In a steam-generator, the combination of the furnace F, boiler K, fire-flues b b, watertubes 6, dome E, central connecting-pipe, N, central stay-rod, M, and inclosing-wall 13, substantially as herein shown.

8. In a steam-generator, the. combination of a boiler having a fire-box on the inside thereof, whereby an annular water-space is formed between the sides of the fire-box and the inner walls of the boiler, and a steam-dome mounted above the boiler and connected therewith by means of the tubes 6 and N, substantially as described, and for the purpose set forth.

. In testimony that I do claim the foregoing 55 as my own I hereby affix my signature in presenoe of two witnesses.

GEORGE XV. LUIZ.

lVitnesses: v

GEO. K. STORM, J OSEPI-I A. BODLEY. 

